847
FNCA52 TJSJ 241930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST FRI JUL 24 2026
DISCUSSION
SURFACE CONDITIONS REMAINED ON THE DRIER SIDE AS A DRIER AIRMASS
DOMINATED THE REGION RESULTING IN RH VALUES DROPPING INTO THE LOW
50S ACROSS STATIONS ALONG THE SOUTHERN COASTAL PLAINS. FOR
TOMORROW SURFACE WINDS WILL REMAIN FROM THE EAST PEAKING UP AT
AROUND 10 AM AST UP TO 15 KNOTS AND SLIGHTLY HIGH IN LOCALIZED
AREAS. RH VALUES FOR TOMORROW WILL RANGE BETWEEN THE MID 50S TO
UPPER 60S DUE TO SOME MOISTURE ASSOCIATED WITH THE PREVIOUS
TROPICAL WAVE.
PRZ014-250800-
SOUTHEAST COASTAL PLAINS-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 10 30
TEMP (24H TREND) 75 (-1) 90 (0) 75 91
RH % (24H TREND) 91 (+5) 59 (0) 91 56
WIND 20FT/EARLY(MPH) E 13 E 18 E 14 E 16
WIND 20FT/LATE(MPH) NE 11 E 21 G29 E 13 E 17
MIXING HGT(FT-AGL/MSL) 5000 5500
TRANSPORT WND (MPH) E 21 E 18
VENT RATE (KT-FT) 90000 88000
DISPERSION 5 5
DSI 4 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-250800-
SOUTHERN HILLS-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 0 30 10 50
TEMP (24H TREND) 71 (-2) 87 (+1) 71 89
RH % (24H TREND) 98 (+7) 63 (+1) 97 61
WIND 20FT/EARLY(MPH) E 11 E 16 E 14 E 12
WIND 20FT/LATE(MPH) NE 12 E 16 E 13 E 13
MIXING HGT(FT-AGL/MSL) 5890 6180
TRANSPORT WND (MPH) E 18 E 16
VENT RATE (KT-FT) 94240 86520
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-250800-
NORTH COASTAL PLAINS-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 40 30 50
TEMP (24H TREND) 75 (0) 89 (0) 75 91
RH % (24H TREND) 98 (+6) 66 (0) 98 61
WIND 20FT/EARLY(MPH) E 18 E 18 E 19 E 16
WIND 20FT/LATE(MPH) E 12 E 23 E 13 E 21
MIXING HGT(FT-AGL/MSL) 4750 5430
TRANSPORT WND (MPH) E 21 E 17
VENT RATE (KT-FT) 85500 81450
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-250800-
NORTHERN HILLS-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 40 10 60
TEMP (24H TREND) 72 (0) 88 (0) 72 90
RH % (24H TREND) 98 (+1) 67 (+4) 99 64
WIND 20FT/EARLY(MPH) E 14 E 16 E 18 E 13
WIND 20FT/LATE(MPH) E 10 E 20 E 10 E 18
MIXING HGT(FT-AGL/MSL) 6010 6430
TRANSPORT WND (MPH) E 18 E 15
VENT RATE (KT-FT) 96160 83590
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-250800-
WEST COAST-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 20 50 10 50
TEMP (24H TREND) 74 (0) 90 (0) 74 92
RH % (24H TREND) 99 (+4) 67 (+4) 100 63
WIND 20FT/EARLY(MPH) E 8 E 13 E 13 E 12
WIND 20FT/LATE(MPH) E 12 SE 16 E 13 E 14
MIXING HGT(FT-AGL/MSL) 4410 4770
TRANSPORT WND (MPH) E 10 E 9
VENT RATE (KT-FT) 39690 38160
DISPERSION 5 5
DSI 2 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-250800-
EASTERN INTERIOR-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 40 30 50
TEMP (24H TREND) 73 (-1) 89 (+2) 73 90
RH % (24H TREND) 99 (+8) 65 (+1) 98 61
WIND 20FT/EARLY(MPH) E 11 E 16 E 14 E 12
WIND 20FT/LATE(MPH) E 14 E 16 E 14 E 13
MIXING HGT(FT-AGL/MSL) 6200 7070
TRANSPORT WND (MPH) E 20 E 16
VENT RATE (KT-FT) 105400 98980
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-250800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 40 40 50
TEMP (24H TREND) 70 (-2) 84 (+3) 70 86
RH % (24H TREND) 100 (+6) 73 (-1) 100 69
WIND 20FT/EARLY(MPH) E 9 E 13 E 12 E 11
WIND 20FT/LATE(MPH) E 10 E 13 E 12 E 11
MIXING HGT(FT-AGL/MSL) 4290 4340
TRANSPORT WND (MPH) E 20 E 16
VENT RATE (KT-FT) 72930 60760
DISPERSION 5 5
DSI 4 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-250800-
CENTRAL MOUNTAIN RANGE-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 10 50 10 70
TEMP (24H TREND) 69 (-1) 86 (+2) 69 87
RH % (24H TREND) 99 (+2) 69 (+2) 99 68
WIND 20FT/EARLY(MPH) E 9 E 10 E 11 E 9
WIND 20FT/LATE(MPH) E 9 E 12 E 9 E 11
MIXING HGT(FT-AGL/MSL) 8020 7640
TRANSPORT WND (MPH) E 13 E 12
VENT RATE (KT-FT) 88220 76400
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-250800-
CAYEY MOUNTAIN RANGE-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 30 20 50
TEMP (24H TREND) 71 (-1) 85 (+2) 71 85
RH % (24H TREND) 100 (+4) 71 (+3) 100 68
WIND 20FT/EARLY(MPH) E 9 E 14 E 12 E 11
WIND 20FT/LATE(MPH) E 10 E 14 E 11 E 11
MIXING HGT(FT-AGL/MSL) 4890 5700
TRANSPORT WND (MPH) E 22 E 16
VENT RATE (KT-FT) 92910 79800
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-250800-
VIEQUES-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40 50
TEMP (24H TREND) 78 (-2) 88 (0) 79 90
RH % (24H TREND) 87 (+8) 63 (0) 88 58
WIND 20FT/EARLY(MPH) E 14 E 19 E 18 E 16
WIND 20FT/LATE(MPH) E 18 E 18 E 18 E 13
MIXING HGT(FT-AGL/MSL) 3110 3210
TRANSPORT WND (MPH) E 24 E 17
VENT RATE (KT-FT) 65310 48150
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-250800-
CULEBRA-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40 30
TEMP (24H TREND) 79 (-1) 89 (+1) 78 90
RH % (24H TREND) 90 (+10) 66 (-3) 90 60
WIND 20FT/EARLY(MPH) E 16 E 19 E 18 E 16
WIND 20FT/LATE(MPH) E 18 E 17 E 18 E 14
MIXING HGT(FT-AGL/MSL) 3160 3170
TRANSPORT WND (MPH) E 24 E 17
VENT RATE (KT-FT) 66360 47550
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-250800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10 30
TEMP (24H TREND) 75 (-1) 90 (0) 75 91
RH % (24H TREND) 93 (+8) 60 (+1) 95 58
WIND 20FT/EARLY(MPH) E 13 E 19 E 19 E 17
WIND 20FT/LATE(MPH) E 11 E 21 E 12 SE 20
MIXING HGT(FT-AGL/MSL) 5140 5200
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 77100 72800
DISPERSION 5 5
DSI 3 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-250800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 30 30
TEMP (24H TREND) 78 (-2) 86 (0) 77 89
RH % (24H TREND) 90 (+9) 67 (-2) 91 62
WIND 20FT/EARLY(MPH) E 17 E 19 E 19 E 16
WIND 20FT/LATE(MPH) E 19 E 18 E 18 E 14
MIXING HGT(FT-AGL/MSL) 3140 2980
TRANSPORT WND (MPH) E 24 E 17
VENT RATE (KT-FT) 65940 44700
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-250800-
ST CROIX-
330 PM AST FRI JUL 24 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 30 30
TEMP (24H TREND) 78 (-2) 87 (0) 77 89
RH % (24H TREND) 93 (+10) 68 (-1) 92 63
WIND 20FT/EARLY(MPH) E 17 E 19 E 18 E 14
WIND 20FT/LATE(MPH) E 18 E 18 E 18 E 13
MIXING HGT(FT-AGL/MSL) 4440 4840
TRANSPORT WND (MPH) E 25 E 18
VENT RATE (KT-FT) 97680 77440
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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